| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 2 | Adams & McGahey | Amarillo, TX 79114 | Oil & Gas Operator | Nov 1998 |
| 3 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Apr 2024 |
| 4 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 5 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 6 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Apr 2024 |
| 7 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 8 | Amedan Resources, Inc. | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2008 |
| 9 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Apr 2024 |
| 10 | Amexco, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 11 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 12 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 13 | Aog, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2014 |
| 14 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 15 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 16 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 17 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Apr 2024 |
| 18 | Archer,Carl M Estate Partnership | Gruver, TX 79040 | Oil & Gas Operator | Sep 2022 |
| 19 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 20 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2024 |
| 21 | Aruba Petroleum Inc | Dallas, TX 75379 | Oil & Gas Operator | Dec 2023 |
| 22 | Atchley Resources Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2024 |
| 23 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Apr 2024 |
| 24 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 25 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Apr 2024 |